Telephone-receiver.



PATENTED JUNE 12, 1906.

0. T. MASON. TELEPHONE RECEIVER.

APPLICATION FILED MAR.17. 1905.

WITNESSESi I INVE/VTUR J I It UNITED 7 CHARLES T. MASON, OF SUMTER,

- SUMTER TELEPHONE MAN UF SOUTH CAROLINA.

SOUTH CAROLINA. ASSIGNOR To AUTURING COMPANY, OF SUMTER,

' TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented J'une 12; 1906.

Application filed March 17. 1905. Serial No. 250,624.

To all whom it mag concern: I

Be it known that I, CHARLES T. MASON, a citizen of the United States,residing at Sumter, in the county of Sumter and State of South Carolina,have invented new and use- 1 Improvements in Telephone-Receivers,ofwhich thefollowing is a specification.

This invention is an improved telephonereceiver characterized by thefact that the magnet structure is molded in a soft-metal section whichis screwed and cemented at adjustment in a cup forming part of thereceiver-casing, whereby the magnet'is held rigidly therein, the casingbeing completed by a removable cap, which also clamps the dia hragm, anda removable handle or shell.

15 further novel feature is embodied in means for removably supportingthe coils and for connecting the same to the terminals of thereceiver-cord.

In the accompanying drawings, Figure 1- is a central longitudinalsectionof the receiver u rhandle section C. The section B sup the casing.

-block '11,- clamped between t with the parts assembled. Fig. 2 is afront end view with the ear-cap and diaphragm removed. Fig. 3 is asectional view of the magnet structure. .Fig. 4 is a perspective view ofone of the coils.

Referring specifically to the drawings, B

indicatesa combined cup and'casing section made of rubber or othercomposition. This cup B is eXteriorly threaded at the front end toreceive the screw-cap A, by which the diaphragm a is clamped to thefront end of the c The casing is completed by the rear 0 orts the magnetstructure and forms a rigl and .permanent union therewith and avoids thenecessity for separate cu and casing sections, since it forms both t ecup and part of The magnet structure comprises the horseshoe-magnet y'and the poleieces b and fiber e front ends of the magnet by a bolt f,and said fiber piece carries the terminals 15., to which thereceivercord 7:. isattached, the terminals "being held by binding-screwsI, which are connected by the like having a low wires 1 to the coils.Around. the magnet structure is molded a block 6, of soft metal orfusing-point, said magnet structure being thereby rigidly fixed therein.The block e is exteriorly threaded and is screwed into and through thebottom of the cup B, thereby having a projecting portion G, onto whichthe handle C is screwed.

In assembling the parts a small space 1) is left between the ledge atthe front end of the block e and the bottom of the cup to allow of theadjustment of the magnet structure to bring the pole-piece inproperrelation to the face of the cup, and consequently to the diaphragm. Thisspace is filled by a suitable ce ment, which also enters between thethreads. While the cement is soft such adjustment as is necessary may bemade, after which the cement sets and hardens and holds the magnetstructure in permanent adjustment. The

coils c are removably held on the pole-piece in the cup, the lower endplate of each coil havin a perforated ear to receive a screwk to holdthe coil upon the block c. This block hasv holes h for theconnecting-wires. The screws 1 allow the coils to be disconnected andremoved without unsoldering any wires. This is advantageous when thecoils have to be replaced for any reason, as when burned out.

It is desirable in receivers to have the magnet structure rigid with thecasing. This is conveniently effected by the invention herein shown,because the ma et structure is molded in the block 6, and t is blockbecomesrigidly fixed to the casing-section B by screwing and cementingtherein, and the block also serves to hold the handle and cup together.t I claim as new, and desire to secure by Letters Patent, is'

In a telephone-receiver, the combination with a magnet structure, of athreaded blockv molded around the front end of the magnet and therearends of the pole-pieces, and having a shoulder around its front end,a cup section forming the middle part of the casing and in which theblock is screwed, lea a space between said shoulder and the bottom ofthe cup, in which space cement is placed to permanently fix the block inthe cup, coils on the ole-pieces, having terminals which extend t 011hholes in the block, and a hendle which incloses the rear end of themagnet structure and is screwed 0n the rear end of the block.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES T. MASON.

Witnesses:

C. G. ROWLAND, MART HALL.

